Brake



R. F. KOHR Jan., 26, 1932..

BRAKE Filed Feb. 14, 1929 ltttllthllt'll KHR, MF' SWU BEND, lNlDl'ANA,ASSIGNCIR T THE STUJDBATER CORPORA- TTN, E' SO'UTH BEND, ENIDANA, A'OTWURATIN OE NEW JEESlE-Y i IEEE application filed February 1d, 1%9.

This invention relates to brakes for motor vehicles and particularly tothe control or operating means tor the parking' bralre.

Heretoiore it has been the common practice to use a controllever movableto operate a pawl or latch to engage with teeth 'tormed in segment orsimilar device to apply the parking bralre. The control meansheretoztore used has had numerous objections and dis- ;ttl advantagesdue to the ;tact that the pawl does not always engage with the teeth andat 'times is difficult to release the same after the bralre has beenset.

lt is, thereiore9 the object ot the present invention to provide acontrol lever and means operated thereby tor i'rictionally engaging thesegment pre'lerablv mounted on the transmission casing to maintain theparlring bralre in operative or engag'ing position.

A further object is to provide the control lever with a slot thereinadapted to receive the segment and a 'wedg'e interposed between an edgeof the slot and the segment Jtor maintaining' the lever in the desiredpos'ti0n- El iurther object is to provide means 'tor releasing the wedgeso that the control lever can be treely moved in one direction.

These being among' the objects ot' the presinvention, 'the same consistsorJ certain W features ot construction and combinations of W the controllever connected therewith.. w

ltligure 2 isan enlarged fragmentary side elevation ot the transmissioncasing'' and bralre control means, certain of the parts being brokenaway and in section to better *115 show the invention.

ligure 3 is a section taken on the line 3-3 of Figure 2.

lFigure 11 isl a side elevation ot a modified ;term 'of the brakecontrol, certain of the W parts being broken away and in section.

Serial No. 839,91'87.

Referring to the numbered parts of the drawngs in which like numeralsrefer to like parts throughout the several views, the transmissioncasing 1 is adapted to contain transmission gears (not shown) andsupport a brake drum 2. A brake control lever 3 is pivotally mounted onthe pin 4 on the transmission casing' 1 and is provided with adownwardly extending arrn 5 having a nose por-- tion 6 adapted to engagewith a wedge 7 mounted in a slot 8 formed in a lever 9 pivotally mountedon the pin d. A link 10 is connected at its one end to the lever 9 andat its opposite end to acam 119 the cain 11 acting to contract the brakeband 12 on the drum 2 The-brake band 12 is normally held out ot contactwith the drum 2 by means of the Springs 13 and 1d positioned on oppositesides oi'pthe bracket 15 secured to the transmission casing 1.

A segment 16 pivotally mounted at 17 on the bracket 15 is spaoed fromthe transmission casing 1l and extends through the slot 8 iormed in thelever 9. The upper edge of the slot 8 on the lever 9 has an inclinedwall 18 which coincides with a face ot the wedge 7, the opposite face otthe wedge being of substantiallv the same Contour as the segment 16 sothat the wedge will freely ride on the segment. The lever 9 has atorwardly extending arm or loop 19 which extends around the arm 5 tor apurpose to be hereinafter described. The lever 9 also has a projectingportion 20 on the side opposite the loop 19; to provide an abutment forreceiving the spring 21 which normally presses the wedge into engagementwith the segment 16 and the inclined face 18. A spring 22 positionedbetween the arm' 9 and the arm 5' prevents the nose portion 6 fromnormally engaging with the wedge 7. w

From. the foregoing description ofv the parts it will readily be seenthat as the leverl 3 is moved in the direction of the arrow A` that thearin 5 which engalges with the loop 19 will move the arm 9 in ananti-clockwise direction and that thel spring 21 will cause the wedge 7to move therewith. As the lever 3. is moved in the direction abovelne'ntioned the same will operate through the link 10 and with the ball.

cam 11 to contract the brake band 12 on drum 2 to 'set the parkingbrake.

When the lever'3 is moved in the opposte direction, the nose portion 6will engage with the wedge 7 against the compression of the spring 22,causing the wedge to unseat from the inclined face 18 and the segment 16whereby the brake band 12 will be released from the drum 2. 'It willthus be seen that as the lever 3 has moved in the direction of the arrowA that the Wed e 7 will Jfollow with the arm 9; that it will xold therespective members in the desired set position and that the movement'ofthe lever 8 in theopposte direction will release the wedge 7 from'theset position to thereby automatically expand the brake band 12 -out ofengagement with the drum 2 to release the parking brake.

In Figure 4 I have shown .a modified form of my invention whichcomprises a ball 25 interposed between the segment '16 of the inclinedface 18 of the slot 8 for accomplishing the same result as the wedgeheretofore described. The ball 25 is maintained in the operativeposition by means of the spring 26 which presses the plunger 27 intoengagement The ball 25 is released-upon movement of the nose portion 6of the arm 5 into engagement therewith, the arm'5 being moved in suchposition against the compression of the spring 22.

`Having thus described my invention, it is to be understood that formalchanges may be made in the specific embodiment of the inventiondescribed without departing from the spirit and substance of the broadinventhe 'tion, the scope of which Vis commensurate with the appendedclaims.

What I claim is: 1.v The combination with a transmission casing, of. anarcuate segment mounted on one side thereof and spaced therefrom,l apivot pin on said casing, a brake Operating handle pivotally mountedupon by said pin, a brake lever pivotally mounted upon by said pin andhaving a slot therein adapted to receive said segment, and a wedge'Operable by the movement of said brake operating lever in 'Onedirection to engage said segment and means whereby the movement of thebrake Operating lever in the opposte direction will disengage said wedgefrom said segment.

2. The combination with a transmission casing, of a brakeoperatinglever, a brake lever, said levers having a common pivot on i saidcasing, an arcuate segment pivotally supported on said casing extendingIthrough a slot in saidbrake lever, awedge within theslot in said 'brakelever engageable with said segment upon movement of said brake Operatinglever in one direction and means Whereby said wedge is disengaged fromsaid segment upon movement of said brake operating lever in the oppostedirection.

moving thesame in either of two directions,

said brake Operating' lever releasing said means when said brakeOperating lever is moved in one direction.

4. The combination with a transmission casing, of an arcuate segmentpivotally mounted on one side thereof, a brake lever pivoted on saidcasin and having a slot therein adapted to recelve said segment, one of.the walls of said slot being at an angle to the face of the segmentadjacent thereto, a wedge engageable with the inclined edge of said slotand with said segment for maintaining said lever in a set position, anda brake Operating lever having a common pivot with said brake lever, andhaving a part engageable with said wedge for releasing said wedge topermit said lever to be moved from its set position.

5. The combination with a transmission casing, of an arcuate se mentpivotally mounted on one side thereo a lever pivoted casing, of anarcuate segment pivotally mounted on one side thereof, a lever havingment pivotally mounted on said casing, One of the edge walls of saidslot being at an angle to the adj acent edge of said segment and theopposed edgewall of said slot being substantially *of the same contouras said segment, a wedge positioned in said slot having one face thereofof substantially the same contour as the edge of said se ment and havingthe opposed` face thereof inclined to seat on the inclined face of thewall forming said slot, a spring positioned between said wedge and saidlever for forcing said wedge into said slot, a brake Operating leverpivotall a "finger portioIL for'engaging the. wedge memberv forreleasing' said wedge to permit.

movement of-said, lever in one Ofsaid dii rections.

8th ay of February, 1929,'

`ROBERT F. KOHR ed byvme a 'soma Bena; Inaiana'thisj

